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V 22.11-12-99
1
Penilaian Formasi Lanjutan
V 1 - 2006
Resistivity LogsInduction Logs
R. Widijanto
November 10, 2006
2V 1 - 2006
Agenda
♦ Basic Principle of Induction Logs1. Induction Principle2. Depth of Penetration3. Borehole Effects4. Bed Thickness Effects
♦ The Spherically Focused Log (SFL)1. Log Presentation
V 22.11-12-99
2
3V 1 - 2006
Basic Principle of Induction Logs
1. Range of Application of Induction Log and Laterolog2. Induction Principle3. Simple two-coil induction measuring system4. Practical Induction Array5. Depth of Penetration of Induction Log6. Borehole Corrections for ILd and ILm7. Dual Induction Focused Log8. Effects of Bedding on Induction Responses9. Bed Thickness Correction to Deep Induction
4V 1 - 2006
Range of Application of Induction Log and Laterolog
V 22.11-12-99
3
5V 1 - 2006
Induction Principle
6V 1 - 2006
Simple two-coil induction measuring system
Principle of the measurement is that the voltage induced in the receiver coil is proportional to the ground loop current, and therefore, proportional to the formation conductivity.
V 22.11-12-99
4
7V 1 - 2006
Practical Induction Array
8V 1 - 2006
Depth of Penetration of Induction Log
V 22.11-12-99
5
9V 1 - 2006
Borehole Corrections for ILd and ILm
10V 1 - 2006
Dual Induction Focused Log
Measures deep resistivity of the formation or close to the true resistivity (Rt)
Measures the medium resistivity of the formation or resistivity of the invaded zone(Ri)
Shallow focused laterolog measures the shallow resistivity of the formation or the resistivity of the flushed zone (Rxo)
V 22.11-12-99
6
11V 1 - 2006
Effects of Bedding on Induction Responses
12V 1 - 2006
Bed Thickness Correction to Deep Induction
6 ft. (1.8 m)
5 ft. (1.5 m)
4 ft. (1.2 m)
3 ft. (0.9 m.)
Rcor (Ω - m)
Rlo
g ( Ω
- m
)
V 22.11-12-99
7
13V 1 - 2006
Tornado Charts
14V 1 - 2006
Induction Resitivity Tool SummaryWireline
Schlumberger Halliburton Baker-Hughes Atlas
Welex GearhartDual Induction Log (DIL) DIL DIL Dual Induction Focused Log (ILD/ILM/SFL) (DIND/MIND/GUARD) (ILD/ILM/LLS) (RILD/RILM/RFOC)
Phasor Induction Log High Resolution Induction (HRI) Dual phase Induction Log (RIDPH/RIMPH/RSFL) (HDRS/HMRS/LL3) (RIPD/RIPM/RSFL)
Array Induction Tool (AIT) High Definition Induction Log (HDIL) (AT10/AT20/AT30/AT60AT90…) (M2RX/M2R9/M2R6/M2R3/M2R1…)
3D Induction Explorer (3DEX)(RESH/RESV…)
Measurement While Drilling
Anadrill Halliburton Baker-Hughes Pathfinder Sperry-Sun Gearhart Spun-off Halliburton
Compensated Dual Res. Electromagnetic Wave Res. Electromagnetic Propagation Res Compensated Wave Res(CDR, ARC5) (EWR, Phase 4, Slim Hole Phase4) (DPR, MPR, (CWGRD)
Reservoir Navigator Service)
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15V 1 - 2006
Induction Summary
16V 1 - 2006
The Spherically Focused Log (SFL)
1. Principle of the Spherically Focused Log2. Depths of Penetration of the Shallow Res Curve3. Typical Presentation of Dual Induction-SFL4. Invasion Correction Chart for Dual Induction-SFL
V 22.11-12-99
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17V 1 - 2006
Principle of the Spherically Focused Log
18V 1 - 2006
Depths of Penetration of the Shallow Res Curve
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19V 1 - 2006
Typical Presentation of Dual Induction-SFL
20V 1 - 2006
Invasion Correction Chart for Dual Induction-SFL
V 22.11-12-99
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21V 1 - 2006
Comparations
♦ Induction Logs• Work best in Fresh Muds• Medium to high porosity conditions• Can be recorded in oil-base mud• Can be recorded in empty hole
♦ Lateralogs• Work best in Salt Muds• Low porosity conditions• High formation resistivity
22V 1 - 2006
Resources♦ Course Materials: http://www.geocities.com/ridwanwd/PFL/
♦ The Society of Petrophysicists and Well Log Analysts:www.spwla.org
♦ Society of Petroleum Engineers: www.spe.orgFormation Evaluation: http://www.spe.org/spe/jsp/basic/0,,1104_1714_1003934,00.html
♦ Schlumberger Interpretation Chart: www.slb.com or http://content.slb.com/Hub/Docs/connect/reference/Chartbook/